Means for moving air against pressure



April 29, 1930. CHARAVAY' 1,756,343

MEANS FOR MOVING AIR AGAINST PRESSURE Fagledl oct. 10, 1927 PatentedA131229 1.93.0 ,A

UNITEn sTATEs ENT OFFICE FREDERICK CHABAVAY, OF PIQUA, OHIO, ASSIGNOB,BY M'ESNE ASSIGNMENTS, OF ONE- HALF T HARTZELL INDUSTRIES, INC., OFWILMINGTON, DELAWARE, A CORPORA- against pressure,

TION 0F DELAWARE uEANsronMovING am ,AGAINST raEssUB-E Application ledOctober 10, 1927. Serial No. 225,137. i

This invention 'relates to new and useful improvements -in means formoving air against pressure. It is the principal object of my inventionto provide for mine, building and other duct service, where lit isnecessary to move a1r a motor Iunit upon whose shaft there is mounted amultiplicity of blower blades, one behind theother. In this assemblyeach vblade adds its work to the others, with the -result thatsubstantially 11000 cubic feet of air a minute may be moved by a one andal half horse power motor against a one and a half inch of waterpressure.

It is another vobject of my invention to provide f suitable means forsecuring the 4blower unit within a metal tube or shell through which airis to be Vmoved against pressure.

Other important and incidental objecfts will be brought out intheffollowing specification and particularly set forth in the subjoinedclaims.

In the accompanying drawings illustrating my invention, Figure 1 is alongitudinal, sectional view taken through a metal tube showing my air.moving unit secured therein. Figure 2 is an end view of said tube,showing said blower unit lmounted therein. Figure 3 is an elevationalview of one Aof the airl moving blades. And Figure 4 is a detail view Yof a portion of one of the eye bolts for se- 4 curing the motor unitwithin the tube.

Referring to the accompanying drawings for a detailed description of myinvention, the numeral 1 designates a metal' tube or shell through whichair is to be moved. For the purpose of moving air through this tubeagainst pressure', Iaxially secure therein by to be described anelectric motor 2 means whose armature shaft projects T froml both endsofi it.l Upon each end of the armature shaft 3 al series of blades4,*preferab1y of aerofoil" action,.are mounted. These blades maybestaggeredas shown inf the drawings-, butare disposedone behind theother,fso that each blade may add its power to that ofthe tubeconveyingtli@y ai?, f0.1 T215?? the. number of `blades used.

In order that each blade may fit the shaft 3 snugly, it is split on eachside of its central hole 5, as shown in Figure 3. On each side of thehole 5, the blade is formed with'a bolt hole to receive a bolt 6. Nuts 7are applied to the threaded ends of these bolts to draw the splitportions of the blade snu ly against the shaft 3 to which lit is applieIn order to true the bladep'roperly to the shaft 3, it is only necessaryto ream the hole 5 to the desired angle.

For the purpose of securing the motor 2 firmly within the tube 1, Iprovide the following means. Projecting through the end plates 8, 8 ofthe motor are studs 9. UponA each end of the studs 9 is a washer 10, andbetween'this washer and a nut 11 the eye portion of an eye bolt12 issecured to the stud. These eye bolts 12` project radially from the studs9 through holes in the metal shell, and also through holes increscent-shaped clamping members 13, whose inner surfaces conform to theperiphery of the shell. To the outer threaded ends of the bolts 12, nuts14 arev applied, the crescent-shaped members 13 serving to prevent theshell being pressed out of shape or distorted when the nuts 14 aretightened. i The bearings/of the motor 2 receive oil through radialtubes 15 which project to them from the exterior of the' shell. l

A radial tube 16 is provided for .the cable 17, which conducts theelectric current to the motor 2, as shown in Figures 1 and 2.

When the motor is rotated by this current, it will turn the shaft 3 torotate the blads 4. These blades being in multiple and disposed onebehind the other, will move a larger amount of air through the tube'thanwould' be possible with one blade, since each blade adds its power tothat of the others. There is thus maintained a uniform pressure, so thata large amount of air may be moved through the shell for mine, buildingor like l service. This pressureis in proportion to I Havingdescribed-[my invention, I claim; 1. .An axial flow fanicomprislng acircular casin ,gamotor having an armature, mounted l i 1.0.0

.riberas-ee .shaft .f iid www.

projecting from both ends of said motor, a plurality of airfoilpropellers mounted in balanced staggered relation on each end of saidshaft.

2. An axial How fan comprising a circu- A lar casing, a source of powermounted in said casing, having a power shaft, a. set of airfoilpropellers mounted on said shaft at each end in balanced staggeredrelation, and bearings o for said shaft intermediate said sets ofpropellets. Y

In testimony whereof I have hereunto set my hand this 7th day ofOctober, 1927.

FREDERICK CHARAVAY.

